Begin by melting your chocolate in a microwave-safe bowl, heating it in 30-second intervals, stirring in between until smooth. Alternatively, use a double boiler on the stovetop.
While the chocolate is cooling, slice your ripe avocados in half, remove the pits, and scoop the flesh into your food processor.
Add the melted chocolate, cocoa powder, almond milk, vanilla extract, and kosher salt to the food processor. If you prefer a sweeter mousse, add agave nectar or maple syrup to taste. Blend everything until smooth and creamy.
Taste your mousse and adjust sweetness or cocoa powder as desired. Blend again if making adjustments.
Transfer the mousse to a bowl or individual serving dishes. Cover with plastic wrap and refrigerate for at least 30 minutes.
Once chilled, serve your mousse topped with fresh raspberries, sliced strawberries, whipped cream, and chocolate shavings.